The ATLAS Muon Trigger “Slice”

Author

Sidoti, A. ; Bellomo, M. ; Biglietti, M. ; Carlino, G. ; Cataldi, G. ; Conventi, F. ; De Cecco, S. ; DiMattia, A. ; Dionisi, C. ; Falciano, S. ; Giagu, S. ; Gorini, E. ; Grancagnolo, S. ; Inada, M. ; Kanaya, N. ; Kono, T. ; Krasznahorkay, A. ; Kiyamura, H

Author_Institution

Istituto Nazionale Fisica Nucleare, Rome

Volume

55

Issue

1

fYear

2008

Firstpage

151

Lastpage

157

Abstract

The ATLAS experiment at the Large Hadron Collider (LHC) will face the challenge of selecting interesting candidate events in proton-proton collisions at 14 TeV center of mass energy, while rejecting the enormous number of background events. The trigger system architecture is organized in three levels. From a bunch crossing rate of 40 MHz, the First Level trigger, hardware implemented, will reduce this rate to around ~75 kHz. Then the software based High Level Trigger (HLT), composed by the Second Level Trigger and the Event Filter reduces the rate to 200 Hz. In this paper, we will present the implementation of the muon trigger ldquoslice,rdquo signal efficiencies, background rejection rates, and system performances (execution time, memory consumption, etc.) for online muon selection based on Monte Carlo simulations and results obtained on real events collected during cosmic data taking runs.

Keywords

Monte Carlo methods; high energy physics instrumentation computing; muon detection; nuclear electronics; position sensitive particle detectors; trigger circuits; ATLAS experiment; HLT; LHC; Monte Carlo simulations; event filter; high level trigger; large hadron collider; muon trigger; proton+proton collisions; trigger system architecture; Computer architecture; Data acquisition; Detectors; Face detection; Filters; Hardware; Large Hadron Collider; Mesons; Physics; Software performance;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/TNS.2007.912883

Filename

4448535